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Texas Instruments LM2594M-3.3/NOPB
- Part No.:
- LM2594M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,624
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Product details
Overview
LM2594M-3.3/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter delivering 3.3 V at up to 0.5 A with ±4% output voltage tolerance, 150-kHz fixed-frequency operation, and input voltage support up to 40 V. It integrates PWM controller, power switch, and protection circuitry in an 8-pin SOIC package and is used in industrial power supplies, embedded system rails, and point-of-load conversion where simplicity and reliability are critical.
For engineers reviewing the LM2594M-3.3/NOPB datasheet, LM2594M-3.3/NOPB pinout, LM2594M-3.3/NOPB application, or LM2594M-3.3/NOPB equivalent, key selection factors include its guaranteed 0.5-A output current, 85-μA standby quiescent current, thermal shutdown, current-limit protection, and compatibility with standard off-the-shelf inductors - all without requiring external compensation.
Technical Context
The LM2594M-3.3/NOPB implements a fixed-frequency (127–173 kHz) current-mode PWM control architecture with internal frequency compensation and TTL-compatible ON/OFF shutdown. Its integrated 0.9–1.2 V saturation voltage power switch enables efficient operation across wide input ranges while maintaining stable regulation under line and load transients.
It operates in continuous conduction mode by default but supports discontinuous mode for low-load applications via inductor selection. Protection features include two-stage current limiting (peak limit: 0.58–1.4 A) and thermal shutdown, with feedback referenced to a precise 1.23-V internal reference (±4% over temperature).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line, load, and temperature - ensures stable logic rail for microcontrollers and FPGAs without external resistive divider. |
| Max Output Current | 0.5 A DC - sufficient for powering multiple I/O peripherals or low-power SoCs without derating at 25°C. |
| Input Voltage Range | 4.5 V to 40 V - supports 12-V and 24-V industrial bus inputs with margin for ripple and transients. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 100–220 μH inductors with minimal EMI filtering requirements. |
| Quiescent Current | 10 mA typical - allows direct connection to always-on supply rails without excessive standby power loss. |
| Standby Current | 85 μA when ON/OFF pin >1.3 V - enables ultra-low-power sleep modes in battery-backed systems. |
| Feedback Reference | 1.23 V ±2.5% - sets output accuracy and defines minimum adjustable output if reconfigured (not applicable to fixed 3.3-V version). |
| Thermal Resistance | RθJA = 150°C/W (SOIC-8) - requires minimal copper area for thermal relief in standard 2-layer PCBs. |
Pinout & Package
LM2594M-3.3/NOPB is housed in an 8-pin surface-mount SOIC package (body size 4.90 mm × 3.91 mm), optimized for thermal performance and layout simplicity. Pins 1–3 are no-connect (NC) but must be soldered to PCB ground plane for heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; soldered to PCB ground for thermal conduction only - no electrical function. |
| 4 | Feedback | Not used in fixed 3.3-V version; internally tied to output - leave floating or bypass to GND per layout guidelines. |
| 5 | ON/OFF | TTL-compatible shutdown control: <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA in OFF state. |
| 6 | Ground | Main power and signal return path; must connect to low-impedance ground plane adjacent to input capacitor. |
| 7 | +VIN | Primary input supply (4.5–40 V); requires ≥68-μF low-ESR tantalum or ceramic input capacitor. |
| 8 | Output | Switch node - connects to catch diode anode and inductor; high dV/dt requires minimized trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch | 0.5-A rated N-channel MOSFET with 0.9–1.2 V saturation voltage - eliminates need for external high-side switch and reduces BOM count. |
| Fixed-Frequency Oscillator | 150-kHz internal clock - enables predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| Self-Protection Circuitry | Two-stage current limit + thermal shutdown - prevents damage during short-circuit or overload without external sensing components. |
| Minimal External Components | Only four required: input cap, output cap, inductor, catch diode - accelerates prototyping and reduces layout risk. |
| Standard Inductor Compatibility | Works with off-the-shelf 100–220 μH shielded inductors - avoids custom magnetics and streamlines sourcing. |
| TTL Shutdown Interface | Logic-level compatible ON/OFF pin with 85-μA standby current - enables direct MCU GPIO control without level-shifting. |
Applications
| Industrial Sensor Node Power | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Powering 3.3-V RS-485 transceivers, analog front-ends, and low-power MCUs in remote environmental monitoring nodes powered from 24-V DC industrial buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V bus to clean, regulated 3.3-V supply with high efficiency (>80% at 0.5 A) and robust transient response. Use Value: Eliminates need for linear regulators or complex synchronous buck controllers - reduces board space and thermal load while meeting IEC 61000-4 immunity requirements. | Use Scenario: Generating stable 3.3-V core voltage for ARM Cortex-M4 microcontrollers in programmable logic controllers (PLCs) operating in harsh factory environments. IC Role / Device Role / Timing Role: Main DC-DC converter supplying processor, memory, and peripheral rails with ±4% output accuracy across −40°C to +125°C ambient. Use Value: Ensures reliable boot and runtime operation under wide input variation and load steps - validated for continuous operation with 100% production-tested output tolerance. |
| POS Terminal Power Management | Legacy Industrial Equipment Retrofit |
Use Scenario: Replacing aging 78L33 linear regulators in point-of-sale terminals to improve efficiency and reduce heatsink requirements on crowded mainboards. IC Role / Device Role / Timing Role: Drop-in buck replacement delivering same 3.3-V output with 3× higher efficiency and lower thermal footprint than LDO-based solutions. Use Value: Cuts standby power consumption by >90% versus linear regulators - extends battery backup time and eliminates thermal throttling during peak transaction loads. | Use Scenario: Modernizing 12-V or 24-V powered legacy PLC I/O modules with obsolete discrete switching designs requiring redesign. IC Role / Device Role / Timing Role: Integrated replacement for discrete transistor+PWM IC solutions - provides single-chip regulation with built-in protection and simplified layout. Use Value: Reduces component count by >60%, cuts assembly cost, and improves long-term reliability with TI's 20+ year product longevity commitment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HVM-3.3/NOPB | Supports 4.5–60 V input (vs. 4.5–40 V); identical pinout, package, and output specs. | Suitable for high-input-voltage applications like automotive 42-V systems or telecom -48-V derived rails. | Select when input may exceed 40 V; otherwise LM2594M-3.3/NOPB offers optimal cost/performance for standard 24-V industrial use. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A output, 2.1-MHz switching, integrated inductor option available. | Enables smaller solution size and higher efficiency (>90%), but requires different layout and control loop tuning. | Choose for new designs prioritizing miniaturization and efficiency; LM2594M-3.3/NOPB remains preferred for legacy compatibility and design simplicity. |
Compared with LM2594HVM-3.3/NOPB, the LM2594M-3.3/NOPB trades 20-V input headroom for lower cost and proven field reliability in 24-V systems; versus LMR36506RNXR, it offers simpler implementation and broader temperature validation but at lower efficiency and larger footprint.
Availability
LM2594M-3.3/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded microcontroller rails, and POS terminal power management requiring stable component supply, long-lifecycle assurance, and full traceability.
Supply support for LM2594M-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of experience in power management ICs.
The LM2594xx series was designed specifically for cost-sensitive, high-reliability industrial and embedded applications requiring simple, robust, and easy-to-design DC-DC conversion with minimal external components.
FAQ
What is the maximum input voltage rating for LM2594M-3.3/NOPB?
The LM2594M-3.3/NOPB has a maximum input voltage rating of 40 V, with recommended operating range from 4.5 V to 40 V. This is distinct from the HV variant (LM2594HVM-3.3/NOPB), which supports up to 60 V. Exceeding 40 V on LM2594M-3.3/NOPB risks permanent damage per absolute maximum ratings.
Does LM2594M-3.3/NOPB require external compensation components?
No, LM2594M-3.3/NOPB includes internal frequency compensation and is designed for stable operation with only four external components: input capacitor, output capacitor, inductor, and catch diode. No external RC networks or compensation pins are needed - simplifying layout and reducing design iteration time.
Can LM2594M-3.3/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594M-3.3/NOPB can be configured as a positive-to-negative converter using the inverting topology shown in TI's datasheet Figure 8-5. However, this requires additional diodes and careful attention to voltage stress limits - the sum of |VIN| + |VOUT| must not exceed 40 V for the standard LM2594M-3.3/NOPB.
What is the typical efficiency of LM2594M-3.3/NOPB at full load?
At VIN = 12 V and ILOAD = 0.5 A, LM2594M-3.3/NOPB achieves typical efficiency of 80%, as specified in Section 7.5 of the datasheet. Efficiency increases with higher input voltages (e.g., ~83% at VIN = 24 V) and decreases at light loads due to fixed quiescent current overhead.
Is LM2594M-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2594M-3.3/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering per IPC/JEDEC J-STD-020.
LM2594M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594M-3.3/NOPB FAQ
1.How can I place an order for LM2594M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594M-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2594M-3.3/NOPB reliable?
The price and inventory of LM2594M-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594M-3.3/NOPB?
LM2594M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594M-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2594M-3.3/NOPB?
For technical support, including LM2594M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2594M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594M-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2594M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594M-3.3/NOPB?
All LM2594M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594M-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2594M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2594M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594M-3.3/NOPB Tags
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